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Non-controlling Interests - Summary of Net Change in Non-controlling Interests (Details) - CAD ($)
$ in Thousands
 12 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Disclosure Of Non Controlling Interests [Line Items]    
Begining Balance $ (32)  
Non-controlling interests 16,219 $ (51)
Other comprehensive income 4,033  
Share-based compensation 3,579  
Acquisitions 60,666 19
Ending Balance 84,465 (32)
Canopy Rivers Corporation    
Disclosure Of Non Controlling Interests [Line Items]    
Non-controlling interests 17,490  
Other comprehensive income 3,998  
Share-based compensation 3,579  
Acquisitions 55,777  
Ending Balance 80,844  
Tweed JA    
Disclosure Of Non Controlling Interests [Line Items]    
Non-controlling interests (366)  
Other comprehensive income 39  
Acquisitions 2,013  
Ending Balance 1,686  
Vert Mirabel    
Disclosure Of Non Controlling Interests [Line Items]    
Non-controlling interests (721)  
Acquisitions 2,876  
Ending Balance 2,155  
Subsidiaries With Other Material Noncontrolling Interests    
Disclosure Of Non Controlling Interests [Line Items]    
Begining Balance (32)  
Non-controlling interests (184) (51)
Other comprehensive income (4)  
Acquisitions   19
Ending Balance $ (220) $ (32)